Greetings, I am currently developing a game which uses CEGUI. I am developing on Linux Mint 17, and got both CEGUI and CEED to build. However, when I run ceed-gui and open a Layout I can only seem to add the following widgets from the Create new widget list:

This means that the look n' feels were not specified (the files datafiles folder). Look at the CEED manual or scan through your project options in CEED. You need to specify the paths for the imagesets etc there.